Hudrodynamic vibration of knife refiner

Abstract

The aim of this article is to study the hydrodynamic vibration of knife refiners. Such vibration occurs due to hydrodynamic processes during the operation of the mill. A mathematical model is proposed that describes hydrodynamic vibration. The hydrodynamic force that excites the mill oscillations consists of the following main components: Impact of the semi-finished product on the auger blades and headset knives; forward and reverse flow interactions; pressure on the knives of the headset. These forces depend on the design and operation of the mill. The error between theoretical and experimental studies does not exceed 20%. Vibration processes of hydrodynamic origin are mainly determined by the impact of the semi-finished product flow on the auger blades at the entrance to the mill. The proposed research technique can be used in other machines, for example, in centrifugal pumps. © 2020 Published under licence by IOP Publishing Ltd.